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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 19,944 | $ 18,895
Accumulated Amortization | 6,100 | 5,236
Unamortized: Trademarks and Other | 2,111 | 2,025
Total Intangible Assets Gross Excluding Goodwill | 22,055 | 20,920
Service portfolios [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 2,197 | 1,995
Accumulated Amortization | 1,531 | 1,344
Patents and trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 401 | 378
Accumulated Amortization | 228 | 201
Collaboration intangible assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 4,023 | 3,724
Accumulated Amortization | 342 | 211
Customer relationships and other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 13,323 | 12,798
Accumulated Amortization | $ 3,999 | $ 3,480

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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